<template>
  <div>
    <table border="1" width="700" style="border-collapse: collapse">
      <caption>
        购物车
      </caption>
      <thead>
        <tr>
          <th>
            <input type="checkbox" v-model="all" />
            <span>全选</span>
          </th>
          <th>名称</th>
          <th>价格</th>
          <th>数量</th>
          <th>总价</th>
          <th>操作</th>
        </tr>
      </thead>
      <tbody>
        <kingHonor
          v-for="(item, index) in goodList"
          :key="index"
          :index="index"
          :name="item.name"
          :price="item.price"
          :num="item.num"
          :checked="item.checked"
          @check="checkbox"
          @add="add"
          @sub="sub"
          @del="del"
        />
      </tbody>
      <tfoot>
        <tr>
          <td>合计:</td>
          <td colspan="5">{{ getSum }}</td>
        </tr>
      </tfoot>
    </table>
  </div>
</template>

<script>
import king from './components/king.vue'
export default {
  components: {
    kingHonor: king,
  },
  data() {
    return {
      goodList: [
        {
          name: '诸葛亮',
          price: 1000,
          num: 1,
          checked: false,
        },
        {
          name: '蔡文姬',
          price: 1500,
          num: 1,
          checked: false,
        },
        {
          name: '妲己',
          price: 2000,
          num: 1,
          checked: false,
        },
        {
          name: '鲁班',
          price: 2200,
          num: 1,
          checked: false,
        },
      ],
    }
  },
  methods: {
    checkbox(i) {
      this.goodList[i].checked = !this.goodList[i].checked
    },
    add(i) {
      this.goodList[i].num++
    },
    sub(i) {
      if (this.goodList[i].num > 1) {
        this.goodList[i].num--
      }
    },
    del(name) {
      this.goodList = this.goodList.filter((item) => item.name != name)
    },
  },
  computed: {
    all: {
      set(val) {
        this.goodList.forEach((item) => (item.checked = val))
      },
      get() {
        return this.goodList.every((item) => item.checked)
      },
    },
    getSum() {
      let arr = this.goodList.filter((item) => item.checked == true)
      return arr.reduce((sum, item) => sum + item.price * item.num, 0)
    },
  },
}
</script>

<style></style>
